A previous study (Fletcher et al., 1959) showed that unoiled eggs stored in plastic-film bags for periods up to seven months maintained a small but consistently higher Haugh unit value throughout, than similarly packaged oiled eggs. Under commercial conditions it was found that mold growth appeared on the shells of the unoiled eggs in many of the bags at three to four months storage.To ascertain the cause of this condition three replications involving a total of 4,860 eggs were stored in similar plastic-film bags under controlled laboratory conditions. For each replication two consecutive days’ eggs produced at the Department of Poultry Husbandry, Ontario Agricultural College, were used. These eggs were held at 55°F. for one and two days respectively before being randomized into 9 lots of 180 eggs each. All eggs were placed on new Keyes trays. Four lots were placed in polyvinylidene chloride film (cryovac) bags and four …